The messages says....
The sound pool file plays when I mouse over and click while it is still in the soundpool.
When I try to move it onto the track I get the error and it will not load the file on the track.
Yet, other files from the same soundpool load and play fine on the track when I play it.
I downloaded all the files again, reinstalled the sounds. It made no difference.
This is probably a pretty standard problem, but I haven't found an answer.
Music Maker 15 premium Win 7 and Vista (64 bit). I have same problem with both OS.